Apparatus for drawing sheet glass



May 1, 1923. ,453,78442 WY J. JACOBS APPARATUS FOR DRAWING SHEET GLASSl Filed Jn. A, 1919 @Mantua winnaar J. JACOBS", or moreno', oHIo', a'ss1eNcn, yBY Mesem ASSIGNMENTS, v'ro THE LIBBEY-OWENS snaar GLASS COMPANY.

AIIAIRIAT''Sl FOR DRAWING SHEET GLASS.

Application tiled January 4, 131e). Serial No.y 269,5?7.

To a?! whom 'it 'may concern.'

. Be it known that' I, lViLLiAM J. Jamais,

a citizen of the United States of America,

residing at Toledo, in the county ot' Lucas and State of Ohio, have invented certain newand useful Improvements in Apparatus iior Drawing Sheet Glass, of which the following', isa specification, reference being had therein to the accompanying drawings.

Thisdnvention relates .to an apparatus for drawing sheet glassand more particularly to ther apparatus for treating the glass preparatory to drawing it into` a fiat sheetof predetermined thickness;` all .as more fully. hereinafter described.

In the drawing I showv a vertical, central` longitudinal sectionv through an apparatus embodying my invention. Y

A .represents the glass tank having at its dischargeI end anarch, B.- C is the toptile of the fifont. wall, or dam block, beneath the arch, they top yof this tile being below the level of the glass in the tank, as shown. D is a gate tile over the dam tile, which may be lowered to stop ,the flow of glass over the dam tile or raised to permit the flow.

E is a horizontal tile, prefere-,bly having its top higher than the dam tile. This tile is shown'as supported on the dam tile C, by

being notched into it, and its forward edge is supported bythe wall, F. G is a jack arch over the tile E and separated from it slightly above the surface of the glass. .,f'

H is an inclined slab, preferably of metal,

and usually made, of nicrome steel, This slab, as shown, has the horizontal section a having its upper surface flush with the upper yface of the tile E, and an anchor lug b engaging a slot in said tile; the inclined 40 portion lettered H, which terminates in a' rounded edge c; the substantially vertical portion fl which is back of the edge c, and the horizontal portion e which rests upon the cross ltile I, below which is a combustion chamber, J. The tile I is supported at its front by the wall K and suitable wallsat each end close the combustion chamber.

At L L are shown burner openings through which controlled gas ames'are projected into the chamber J to. control the heat beneath. the inclined slab H. The products of combustion from chambers J may pass out athrough ports M in the top of the wall F and beneath the tile E, thus heating that spaced from the drawing lip a sufficient dis-' y 7.o Above the slab H is a hollow casing, R,

tance to draw the sheet to gage.

through which water is circulated,` in any vSti well-known manner. This cooler may supported at variousr points along the glass which flows on to the slab, orat various dis1 tances' from it. -The usual practice is' to have it rest on suitablel side supportsand put in or remove blocks or shims to vary.

the height,- and adjust it by hand to dif-y ferent points along theslab. y

The operation ofv the deviceis as follows:

The glass having melted in the tank and the gate D being raised, the glass will flow out over the tile in a shallow sheet, down the slab H. This sheet is started by the use of the usual bait, `and after it is started and the width obtained so that the edge rolls grasp the edges of the sheet, the drawing mechanism will continue to drawthe sheet outward as long as the glass is supplied.

The glass may be reduced to the desired drawing temperature, by means of the cooler R, and a regulation of the temperature beneath the slab H may be obtained by regulating the gas supplied` into the chamber J. By the use of the inclined slab, the glass 1n the tank may be kept at a lower 'tempera' ture, as gravity tends to help the flow. By I.

having theslabf metal it may be thinner and the regulation of the temperature of the stream or sheet of glass upon it more readily effected. y

, The use of anletallic lip 'i or edge, from which the glass 1s (drawn, prevents the formation of ribs or grooves in the .under sur-- face of the drawn sheet, which sometimes appear when it is drawn from a tile or brick edge-due to the unevenness ot such tile or'A brick structure. Even when the tile, when new, has a smooth edge, it is apt to be broken,

i or nickedin working with the usual tools y l With this inclined slab, I find I may flow Vthe further coo the lass upon it directly'into the open atmosp ere, and part of the cooling may be accomplished b radiation into the room and ling by the cooler R and regulation of the heat beneath.

What I claimas new is:

1. In a sheet glass drawing apparatus, the combination with a means for supplying molten lass continuously, of a metallic slab onto w ich the glass vfrom the vsupply is adapted to flow in a continuous sheet, means for cooling the lass whileon the slab, and means for stretc ing it from the edge of the slab into a sheet of predetermined thickness.

2. 'In a sheet glass drawing apparatus. the combination with a means for supplying molten glass continuously, of a slab onto which the glass from the supply is-adapted to ow in the open air as a continuons sheet, a metallic drawing edge on said slab, means 4for cooling the glass While ,ongthef slab, and means for stretching it laterally from the edge of-the slab into a sheet 'of predetermined thickness.

3. In a sheet glass apparatus, the combi! nation with a tank having an outlet for 'molten glass, of a slab at the outlet over which the glass is adapted to flow in` the open air as a' continuous sheet, a cooling device above the flowing glass on the slab and` a rounded discharge end on said slab, from which the erally.

4. In a sheet glass apparatus, the combiy nation with a glass tank havinga laterall outlet in the wall and a metallic slab forming the floor over which the glass is adapted to flow in a sheet and from which it is adapted to be drawn, of a regulating heating chamber below said slab, and a cooling device abo-ve said slab,

6. In a sheet glass apparatus, lthe combination of a glass tank having a lateral outlet below the glass level, the flow-block E, the wall F, supporting said block, thc Wall K separated from the wall F. the inclined slab extending beyondv the wall Fand having its outer edge supported by the wall K, A

and a heating chamber beneath the slab.

In testimony whereof I atlix 1n y signature.

WILLIAM J. JACOBS.

glass is adapted to be drawn lat# 

